/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/** A utility class to Marshall and Unmarshall object and object bytes 
    @author Shrideep Pallickara
    $Date$
    $Revision$
 */

public class ObjectMarshaller {
  
  /** Marshall an object into a byte stream */
  public static byte[] marshall(Object object) 
    throws IOException {
    ByteArrayOutputStream baOutputStream = new ByteArrayOutputStream();
    ObjectOutputStream oOut = new ObjectOutputStream(baOutputStream);
    oOut.writeObject(object);
    byte[] objectBytes = baOutputStream.toByteArray();
    return objectBytes;
  }


  /** Unmrahsall an object from a byte stream */
  public static Object unmarshall(byte[] objectBytes) 
    throws IOException, ClassNotFoundException {
    ByteArrayInputStream baInputStream = 
      new ByteArrayInputStream(objectBytes);
    ObjectInputStream oin = new ObjectInputStream(baInputStream);
    Object object = oin.readObject();
    
    return object;
  }

  /** Writes an object onto a DataOutputStream */
  public static void writeObject(Object object, DataOutputStream dout) 
    throws IOException {
     byte[] objectBytes = marshall(object);
     dout.writeInt(objectBytes.length);
     dout.write(objectBytes);
  }

  
  /** Reads an object that was written using the <i>writeObject(object, 
      DataOutputStream)</i> from a DataInputStream */
  public static Object readObject(DataInputStream din) 
    throws IOException, ClassNotFoundException {
    byte[] objectBytes = new byte[din.readInt()];
    din.readFully(objectBytes);
    return unmarshall(objectBytes);
  }

}
